I haven't found much of a problem with damage to cameras from shooting wet plates other than a few small silver spots on the inside of the 8x10 back on my Century studio camera. I'm careful to wipe the backs of my plates after they come out of the silver bath, so they're less likely to drip and that seems to take care of 99% of the problems. Coat the inside of your back with several coats of satin varnish to protect the wood, and wipe everything off at the end of a session.